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⚡ Bolt: Memoize expensive computations in TreeNode#16

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julesklord merged 1 commit into
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bolt-memoize-treenode-14397327542793465257
Jul 2, 2026
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⚡ Bolt: Memoize expensive computations in TreeNode#16
julesklord merged 1 commit into
mainfrom
bolt-memoize-treenode-14397327542793465257

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@julesklord

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💡 What: Wrapped node.children array sorting and recursive countFiles(node) computation in React.useMemo.
🎯 Why: TreeNode components are deeply nested and render many instances. Without memoization, expanding a folder or re-rendering would recompute the sort and recursive file count for every node, potentially causing main-thread stuttering for large repositories.
📊 Impact: Reduces synchronous calculation time during rendering of the file explorer tree. Complexity changes from re-sorting and recounting per render to only updating when the tree data structure for that node changes.
🔬 Measurement: Can be observed by profiling the React render cycle when navigating large directories and noting reduced time spent in TreeNodeInner.

Also includes bolt.md documentation for critical learnings.


PR created automatically by Jules for task 14397327542793465257 started by @julesklord

- Wraps children sorting in `React.useMemo` to prevent sorting large directories on every render
- Wraps recursive file counting in `React.useMemo` to prevent walking large directory subtrees on every render
- Documented performance learnings in `.jules/bolt.md`

Co-authored-by: julesklord <801266+julesklord@users.noreply.github.com>
@google-labs-jules

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@julesklord julesklord merged commit c5135ee into main Jul 2, 2026
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